如何以编程方式将较大的NSImage放置在较小的NSImageView中？

问题描述

假设我有一个100x100的NSImage。我还有一个50x50的NSImageView。有没有一种方法可以将NSImage放置在NSImageView内部的坐标处，从而可以控制显示的哪一部分？似乎NSImage没有initWithFrame方法...

Let's say I have an NSImage that's 100x100. I also have an NSImageView that's 50x50. Is there a way I can place the NSImage at coordinates inside the NSImageView, so I can control which part of it shows? It didn't seem like NSImage had an initWithFrame method...

推荐答案

我在我的NSImageView子类中做到了这一点，就像安德鲁建议的那样。

I did this in my NSImageView subclass, as Andrew suggested.

- (void)drawRect:(NSRect)rect
{
    [super drawRect:rect];
    NSRect cropRect = NSMakeRect(x, y, w, h);
    [image drawAtPoint:NSZeroPoint
              fromRect:cropRect
             operation:NSCompositeCopy
              fraction:1];
}

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